我有以下代码在我的应用程序中显示Snackbar。
#region Snackbar
private const int SnackbarDuration = 1100;
/// <summary>
/// Shows a snackbar. Counts with the fact that there is a CoordinatorLayout with ID coordinatorLayout in your activity layout.
/// </summary>
/// <param name="activity"></param>
/// <param name="text"></param>
/// <param name="duration"></param>
public static void ShowSnackbar(Activity activity, string text, int duration = SnackbarDuration)
{
StyleAndShowSnackbar(activity, text, duration);
}
/// <summary>
/// Shows a snackbar. Counts with the fact that there is a CoordinatorLayout with ID coordinatorLayout in your activity layout.
/// </summary>
/// <param name="activity"></param>
/// <param name="stringId"></param>
/// <param name="duration"></param>
public static void ShowSnackbar(Activity activity, int stringId, int duration = SnackbarDuration)
{
StyleAndShowSnackbar(activity, stringId, duration);
}
private static void StyleAndShowSnackbar(Activity activity, object stringOrStringId, int duration)
{
var snackbarLayout = activity.FindViewById<CoordinatorLayout>(Resource.Id.coordinatorLayout);
if (snackbarLayout == null) return;
Snackbar snackbar;
if (stringOrStringId is int)
snackbar = Snackbar.Make(snackbarLayout, (int)stringOrStringId, duration);
else
snackbar = Snackbar.Make(snackbarLayout, (string)stringOrStringId, duration);
snackbar.StyleSnackbar();
snackbar.Show();
snackbar.Dispose();
snackbarLayout.Dispose();
}
private static void StyleSnackbar(this Snackbar snackbar)
{
var snackbarView = (ViewGroup)snackbar.View;
snackbarView.SetBackgroundColor(Color.LightGray);
var snackbarTextView = snackbarView.FindViewById<TextView>(Resource.Id.snackbar_text);
snackbarTextView.SetTextColor(Color.Black);
snackbarView.Dispose();
snackbarTextView.Dispose();
}
#endregion
这是从我的代码中引用的协调器布局(请注意,这包含在我的布局中 - 它没有单独使用):
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/coordinatorLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true">
</android.support.design.widget.CoordinatorLayout>
一切都在API 22上运行良好,直到我在Android M和早于API 22测试它(可能不是主要原因)。在调用Show()之后,App崩溃并出现以下异常。
01-01 15:10:45.454 E / AndroidRuntime(2482):致命异乎寻常:主要 01-01 15:10:45.454 E / AndroidRuntime(2482):流程: com.psonar.android,PID:2482 01-01 15:10:45.454 E / AndroidRuntime( 2482):java.lang.NullPointerException:尝试调用虚拟 方法&#39; int android.text.Layout.getLineCount()&#39;在null对象上 参考01-01 15:10:45.454 E / AndroidRuntime(2482):at android.support.design.widget.Snackbar $ SnackbarLayout.onMeasure(Snackbar.java:707) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.View.measure(View.java:18788)01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:610) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.widget.LinearLayout.measureVertical(LinearLay01-01 15:10:45.454 E / AndroidRuntime(2482):at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:677) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.View.measure(View.java:18788)01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)01-01 15:10:45.454 E / AndroidRuntime(2482):at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.View.measure(View.java:18788)01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.widget.LinearLayout.measureVertical(LinearLayout.java:748) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.widget.LinearLayout.onMeasure(LinearLayout.java:630)01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.View.measure(View.java:18788)01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.View.measure(View.java:18788)01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.widget.LinearLayout.measureVertical(LinearLayout.java:748) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.widget.LinearLayout.onMeasure(LinearLayout.java:630)01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.View.measure(View.java:18788)01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)01-01 15:10:45.454 E / AndroidRuntime(2482):at com.android.internal.policy.PhoneWindow $ DecorView.onMeasure(PhoneWindow.java:2643) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.View.measure(View.java:18788)01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2100)01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1216) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1452) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.ViewRootImpl $ TraversalRunnable.run(ViewRootImpl.java:6013) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.Choreographer $ CallbackRecord.run(Choreographer.java:858) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.Choreographer.doCallbacks(Choreographer.java:670)01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.Choreographer.doFrame(Choreographer.java:606)01-01 15:10:45.454 E / AndroidRuntime(2482):at android.view.Choreographer $ FrameDisplayEventReceiver.run(Choreographer.java:844) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.os.Handler.handleCallback(Handler.java:739)01-01 15:10:45.454 E / AndroidRuntime(2482):at android.os.Handler.dispatchMessage(Handler.java:95)01-01 15:10:45.454 E / AndroidRuntime(2482):在android.os.Looper.loop(Looper.java:148) 01-01 15:10:45.454 E / AndroidRuntime(2482):at android.app.ActivityThread.main(ActivityThread.java:5417)01-01 15:10:45.454 E / AndroidRuntime(2482):at java.lang.reflect.Method.invoke(Native Method)01-01 15:10:45.454 E / AndroidRuntime(2482):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:726) 01-01 15:10:45.454 E / AndroidRuntime(2482):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
我尝试从我的代码中删除Dispose()调用,以查看它是否会产生影响,但事实并非如此。
答案 0 :(得分:1)
简单清理解决方案并完全卸载应用程序并重新安装就可以了。
我希望它更多,但最初它起作用然后停止然后清理并重新安装解决它(对于Android M我必须删除并重新安装设备图像)。